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J. F. WITTMANN.

AIR COOLER FOR ENGINES.

APPLICATION FILED JUNE 2, 1919.

2 SHEETS-SHEET l.

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Patented Apr. 13, 1920.

L- F. WITTMANN.

AIR COOLER FOR ENGINES.

APPLICATION FILED JUNE 2, 1919.

51,336,457. Patented Apr. 13, 1920.

2 SHEETSSHEET 2.

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A T7'ORNEX UNITED STA PATENT OFFICE.

JOKSHAN F. WITTMANN, OF ST. LOUIS, MISSOURI.

AIR-COOLER ENGINES.

Application filed June 2,

To all whom, it may concern:

F30 it known that l, JoksiIAN F. l rr'rnine, a citizen of the UnitedStates, residing at tit. Louis. State of li lissouri, have inventedcertain new and userul ln'iprovements in Air-Coolers for Engines, ofwhich the following is a full, clear, and exact description, referencebeing had to the accompanying drawings, forming a part hereof.

The present invention is directed to improvements in air coolers forinternal combustion engines, particularly those employed in connectionwith automobiles or self-propelled vehicles, the object of the in\ention being to substitute suitable air cooling means for theconventional radiators and water circulating systems so generallyemployed. The use of an air cooling system materially simplifies thestructure, eliminates troublesome leaks, and at the same time reducesthe weight by dispensing with the radiator. It possesses further andother advantages better apparent from the following detailed descriptionof the invention in connection with the accompanying drawings in which-Figure 1 represents a side elevation of an automobile with part ofthehood removed showing my invention applied to the engine of the car;Fig. 2 is an enlarged side elevation of the engine and invention appliedthereto with parts broken away; Fig. 8 is a top plan of the air movingapparatus for circulating the air; Fig. 4 is an enlarged front elevationof the air moving apparatus; Fig. 5 is an enlarged side elevation of thesame; and Fig. 6 is a middlev Vertical transverse section on the line6-6 of Fig. 1.

Referring to the drawings, A, represents an automobile provided with anengine E, the cylinders 1 whereof are surrounded by an air jacket .9,for the circulation of the cooling medium or air employed under thepresent system. Tapping the inner side wall of the jacket at the middleand near the bottom thereof is one end of a circulating pipe or conduit2, the opposite end of the pipe connecting to the fan or blower casing 3mounted at the front of the car, said casing being provided with a fanor blower 4i mounted on a shaft 5. Tapping the top of the jacket 3 atthe front end is one end of a circulating pipe or conduit 6, theopposite end of the pipe connecting to the fan casing 7 provided with anexhaust fan 8 mounted on the shaft 5. The fan casings Specification ofLetters Patent.

Patented Apr. 13, 1920.

1919. Serial No. 301,213.

3 and 7 are preferably made in sections or halves a, a, and a, a,respectively, the respective sections and casings being secured togetherby bolts I), b, as shown, and supported in front of the engine by thebrackets 9, 9, mounted on the frame F of the chassis, the tops of thebrackets being engaged by the angle pieces 1t", 10, bolted. to the fancasings. Any other method of securing the fan casings to the car couldobviously be resorted to. The opposite faces of the fan casings areprovided with bearings 11 for the partial support of the fan-shaft 5,said bearings being equipped with oil cups 12 for lubricating the shaft,the latter being provided with a belt-pulley 13 on the end adjacent theengine, said end being supported by a bracket (Z leading from thegear-case The fans a and 8 are secured to the shaft 5 by set screws 141as shown (Fig. 6). The casing 3 is provided with a bottom in take leg15, and a top discharge leg 16 to which the pipe 2 is directly coupled;and the casing 7 is provided with a top intake leg 17 to which the pipe(3 is coupled, and with a bottom discharge leg 18. The leg 15 isprovided with an intake elbow 19 into which the outside air is directlydrawn, the engine and fans being inclosed in a hood H 'preferablvprovided at the front with screen H for filtering the air and excludingdust, dirt, and solid particles from the fan casings. In the presentembodiment of the invention I provide the usual cam-shaft 20 of theengine with a belt-pulley 21 which is connected to the pulley 13 on theshaft 5 by a belt 22.

When the engine is running the pulley 13 is rapidly driven by the camshaft, the fans l; and 8 being rapidly revolved in their respectivecasings. Atmospheric air is thereby sucked into the casing 3, throughthe elbow 19 (which is placed in front of the engine so as to get aslarge a complement of cool. air possible). and blown out of the leg 16through the pipe, 2 and into the air jacket or space 8 around the enginecylinders. The air jacket 8. it is seen, thus takes the place of thewell known water jacket, when water is used as a cooling medium. Thecool air is forced through the air jacket around the engine cylinders bythe blower -l, taking up the heat of the cylinders and is finally suckedout through the pipe 6 by the exhaust fan 8 into and through the casing7, and finally is expelled through the leg circulation, the intake endof the 18. A constant and rapid circulation of air keeps the cylinderscool and is not subject to leaks as is the case where water iscirculated through a radiator; and, of course, does not freeze in coldweather. It is ob vious of. course that one of the fans might bedispensed with so far as the invention is concerned, but in practice thearrangement here shown constitutes the most practical arrangement foraccomplishing the results desired, and for bringing about an effectiveand positive circulation of the cooling me dium or air. The apparatusmight be altered in many particulars without involving a departure fromthe nature or spirit of the invention. For example, as shown, only asingle air-jacket surrounds the several cylinders of the engine; butobviously we may have a separate jacket foreach cylinder with suitablemeans for either establishing inter communication between the jackets,or a separate communication with the circulating conduits 2 and 6. ortheir equii-"alent. To maintain an effective and frictionless conduit 2should be substantially diametrically opposite the intake elbow 19, andthe discharge end thereof should tap the air-jacket at or near thebottom; the discharge end of the conduit 6 should be substantiallydiametrically opposite the exhaust leg 18, and the intake end thereofshould tap the aiujaclmt at or near the top, the ca ings 3 and 7 beingjuxtaposed and the legs 15, i7, and l6, 18, being respectivelydiagonally op n-mite one another.

Having described my invention. what I claim is:

1. In combination with an internal com bustion'engine provided withcylinders, an air acket surrounding said cylinders, a fan blower mountedin front of the engine, means for supporting said engine and blower, acirculating pipe leading from the blower to the bottom of the airjacket, an exhaust fan mounted in front of the engine, an exhaust pipeleading from the'top of the air jacket to the exhaust fan, and drivingmeans for said fans.

2. In combination with an internal coinbustion engine provided withcylinders, a frame supporting said engine, an air jacket surroundingsaid cylinders, a fan blower mounted in front of the engine, a bracketon the aforesaid frame for supporting said blower, a circulating pipeleading from the blower to the air jacket, an exhaust fan mounted infront of the engine and supported by th aforesaid bracket, an exhaustpipe leading from the air jacket to the exhaust fan, driving means forsaid fans, a hood inclosing the engine and fans, and a screen in frontof the hood.

3. In an air cooling system for internalv combustion cylinder types ofengines for self-propelled vehicles, an engine, an airjacket surroundingthe cylinders thereof, a blower and easing therefor, a circulatingconduit connecting the blower casing: with the bottom of the. airjacket, an exhaust fan and easing therefor,-a circulating exhaustconduit leading from the top of the air jacket to the casing of theexhaust fan an intake for the blower casing substantially diametricallyopposite to the intake of the circulating conduit leading thercirom, anexhaust leg for the casing of the exha fan disposed substantiallydiametrically j A posite the discharge end of the circulating conduitleading therefrom, the casings of the blower and erhauster beingjuxtaposed, the intake leg of the former being d'i g onally opposite theintake leg of the latter, and the outlet leg of the blower beingdiagonally opposite the outlet of the exhauster, and means for drivingthe blower and exhaust fan from the engine aforesaid.

In testimony whereof I allix my signature in presence of two witnesses.

JOKSHAN 1*. WI'I'lh [AKN lVitnesses arr-L STAREK, ELSE M. Srnonn.

